Everyone understands the need for communications in Modern Project Management. I doubt that anyone would disagree that good communication is a key success factor in any project. The more complex the project is, the more important communication becomes. Communication comes in four main forms: formal, informal, verbal, non-verbal. Most projects will require communications using each one of these forms, and in many cases the same information will need to be communicated using multiple methods to make sure all involved have a good understanding.

Increasing experience and abilities in the use of communication channels and knowing when to use each form will improve the chances of successfully completing projects. Being able to communicate on an interpersonal level, to small groups, or to a large audience, and knowing when to use each type of communication is essential to becoming an effective project manager, but even being expert in all types of communication is not enough.

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http://www.pmi.org/learning/library/external-communication-integral-project-planning-5180